An efficient method for increasing mass flow capture ratio of a three-dimensional sidewall compression scramjet inlet

For a typical backward-sweep sidewall compression scramjet inlet with two ramps and mid-located sidewalls,a modified inlet with higher mass flow capture ratio was designed by reducing the second ramp angle and using circular arc compression surface.The flow filed was numerically simulated and comparisons were made between the modified inlet and the typical one at the free stream Mach number of 6 and 4.Numerical results indicate that most of the performance parameters of the modified inlet are obviously improved and the mass flow capture ratio is greatly increased by using the new method.At Mach 6 incoming condition,the mass capture ratio of the modified inlet was 0.87,which was 14.5 percent higher than that of the typical one;at Mach 4 incoming condition,the mass flow capture ratio was 0.69,19% percent higher than that of the typical one.